<?php
   //设定字符集
   header(`Content-type:text/html;charset=utf-8`);
  //定义一个常量，保存所有商品的折扣
  const DISCOUNT =0.8;
  //定义变量，保存所有商品的名称
  $fruitl='香蕉';
  $fruit2='苹果';
  $fruit3='橘子';
  //对应商品的购买数量（斤）
   $fruit1_num=2;
   $fruit2_num=3;
   $fruit3_num=3;
   //
   $fruit1_price=7.99;
   $fruit2_price=6.89;
   $fruit3_price=3.99;
   //
  $fruit1_total=$fruit1_num*$fruit1_price;
  $fruit2_total=$frui21_num*$fruit2_price;
  $fruit3_total=$fruit3_num*$fruit3_price;
  //
  $total=($fruit1_total+$fruit2_tol+$fruit3_total)*DISTCOUNT;
//
$str="<table>";
$str .="<tr><td>商品名称</td><td>购买数量(斤）</td><td>商品价格</td></tr>";
$str .="<tr><td>$fruit1</td> <td>$friut1_num</td> <td>$fruit1_price</td>";
$str .="<tr><td>$fruit2</td> <td>$friut2_num</td> <td>$fruit2_price</td>";
$str .="<tr><td>$fruit3</td> <td>$friut3_num</td> <td>$fruit3_price</td>";
$str .="<tr><td cosplan='3'>商品折扣：<span>".DISCOUNT."</span></td></tr>";
$str .="<tr><td cosplan='3'>打折后购买总价格：{$total}元</td></tr>";
$str .="</table>";
//
echo $str;